This document specifies the test apparatus, specimens, test procedures, test results and test reports for multiaxial thermomechanical fatigue tests of metallic materials under axial-torsional strain control. This document is applicable to metal thin-walled tube samples under the conditions of constant axial mechanical strain cycle, constant shear strain cycle and constant temperature cycle, corresponding to any constant cyclic strain ratio, constant axial mechanical strain-shear strain phase difference and a constant axial mechanical strain-temperature phase difference test. Note 1: The number of cycles usually considers the category of low cycle fatigue, that is, the fatigue life Nf≤105. Note 2: The temperature of the test generally does not exceed 1200 ℃.
GB/T 16825.1 Metallic materials—Calibration and verification of static uniaxial testing machines—Part1:Tension/compression testing machines—Calibration and verification of the force-measuring system*, 2022-10-14 Update
GB/T 228.1 Metallic materials—Tensile testing—Part 1: Method of test at room temperature
GB/T 228.2 Metallic materials.Tensile testing.Part 2:Method of test at elevated temperature
GB/T 25917.1 Uniaxial fatigue testing systems—Part 1: Calibration of dynamic force